Best link building services

Payment Article submitter services (AMA, Linkjuicer, etc)
PRO: high number of backlinks, auto submitting, other useful services (article rewriting, etc)
CONS: high cost (from 47$/month), require to spun articles, low quality backlinks, no traffic from backlinks

Free Article submitter services (Freetrafficsystem, etc)
PRO: high number of backlinks, auto submitting
CONS: require to spun articles, low quality backlinks, no traffic from backlinks

Web2.0
PRO: medium quality backlinks, some traffic from backlinks, possibility to create a reputation, RSS feed to duplicate the number of backlinks
CONS: require to spun articles, low number of backlinks, rules to respect in order to be published, time required to submit each article

Article directories
PRO: medium quality backlinks, some traffic from backlinks, possibility to create a reputation
CONS: require to spun articles, low number of backlinks, rules to respect in order to be published, time required to submit each article

Article directories submitting softwares
PRO: high number of backlinks, auto submitting
CONS: require to spun articles, low quality backlinks, no traffic backlinks, fee (monthly or one time only)

Profile backlinks from high PR forums
PRO: high quality of backlinks, fast submitting time
CONS: low number of backlinks, time spent to search high PR site / monthly fee to have a list (about 5-10$/month)

Blog comments backlinks high PR sites
PRO: very high quality of backlinks (directly from high PR pages), fast submitting time
CONS: low number of backlinks, time spent to search high PR site / monthly fee to have a list (about 5-10$/month)